Where the discharge stack has a long drain connection to an inspection chamber, access for rodding and testing should be provided at or near the base of the stack. When ground floor appliances are connected to the soil stack, the access point should be sited above the spillover level of the appliances.

For multi-storey domestic buildings, access into the stack should be provided at 3 storey intervals and for multi-storey commercial buildings access should be provided on each floor.